I ordered this bra in the usual size I wear in another brand. The band size was fine, but the cups were about double what I expected. I almost fell on the floor laughing when trying it on.
I don't know what they were thinking, but this fabric is like parachute-quality. So maybe it would save your life some day if you fell from an airplane or something. It is stiff, unyielding and thick and more suitable to make backpacks. I even went down a cup size, but there is nothing snug about it. It was loose all over. Just no.